How To Setup Master Slave In Jenkins

Create another server and install java in it using the command i.e mentioned in installing jenkins on ubuntu, we will consider this server as a slave server

sudo apt install openjdk-8-jdk -y

Setup Jenkins Slave

Create the user and add user to wheel group.

useradd jenkins-slave-01

Create SSH Keys

sudo su - jenkins-slave-01
ssh-keygen -t rsa -N "" -f /home/jenkins-slave-01/.ssh/id_rsa

The private and public keys are created at these locations.

`/home/jenkins-slave-01/.ssh/id_rsa` and `/home/jenkins-slave-01/.ssh/id_rsa.pub`

cd .ssh
cat id_rsa.pub > authorized_keys
chmod 700 authorized_keys

Configuration on Master

• Copy public key[id_rsa.pub] of slave node to Node’s known_hosts file of Master.

mkdir -p /var/lib/jenkins/.ssh
cd /var/lib/jenkins/.ssh
ssh-keyscan -H SLAVE-NODE-IP-OR-HOSTNAME >>/var/lib/jenkins/.ssh/known_hosts

ssh-keyscan -H 172.31.*.* >>/var/lib/jenkins/.ssh/known_hosts

chown jenkins:jenkins known_hosts
chmod 700 known_hosts

Configure the Slave using Manage Jenkins

• Configure the node as shown here,go to Manage Jenkins > Manage Nodes > New Node


Test Jenkins Jobs

1. Create “new item”

2. Enter an item name – My-First-Project

a) Chose Freestyle project

3. Under General Section

a) Choose Restrict where this project can be run

• Update your jenkins slave label Java

4. Under Build section Execute shell

#!/bin/bash
whoami

5. Save your job

6. Build job

7. Check “console output”